PCM Diagnostic Codes

00: No PCM faults
12: No engine RPM References pulses
13: Oxygen sensor circuit fault
14: Shorted coolant sensor circuit fault
15: Open coolant sensor circuit fault
21: Open throttle position sensor circuit fault
22: Shorted throttle position sensor circuit fault
23: Open MAT sensor circuit fault
24: VSS circuit fault
25: Shorted MAT sensor circuit fault
32: EGR system fault
33: Open MAP sensor circuit fault
34: Shorted MAP sensor circuit fault
42: EST/bypass circuit fault
43: ESC failure
44: Lean O2 signal
45: Rich O2 signal
51: PROM error
52: Backup fuel cal-pack missing
54: Fuel pump relay malfunction
55: A/D Converter malfunction

Great, thanks for sharing that.

Since this is gonna be a sticky, I figured i would post the complete list of codes according to the 95 Fleetwood FSM... Here goes...

PCM diagnostics codes... (-00)

11: malfunction indicator lamp (MIL) circuit
13: Bank 1 (left) heated o2 sensor (open circuit)
14: Engine coolant coolant temperature sensor (siganl voltage low, high tempurature indicated)
15: Engine coolant coolant temperature sensor (siganl voltage high, low tempurature indicated.
16: Distributor ignition system (low resolution pulse)
18: injector circuits.
21: Throttle position sensor TPS circuit (signal voltage high)
22: Throttle position sensor TPS circuit (signal voltage low)
23: Air intake temperature IAT sensor circuit (signal voltage high, low temperature indicated.
24: Vehicle speed sensor (VSS) circuit.
25: Air intake temperature IAT sensor circuit (signal voltage low, high temperature indicated
26: Evaporative emission (EVAP) canister purge solenoid circuit.
27: Exhaust gas recirculation (EGR) vaccum control signal solenoid valve circuit
28: transmission range (TR) pressure switch assembly fault
29: Secondary air injector (AIR) pump circuit.
32: Exhaust gas recirculation (EGR) 1 of 2
33: Manifold absolute Pressure (MAP) sensor circuit (signal voltage high- vacuum low)
34: Manifold absolute Pressure (MAP) sensor circuit (signal voltage low-vacuum high)
36: Distrigutor ignition system (faulty high resolution pulse or extra low resolution pulse detected.)
37: brake switch stuck on
38: brake switch stuck off
41: Ignition control (IC) circuit (open)
42: Ignition control (IC) circuit (shorted or grounded circuit)
43: Knock sensor (KS) circuit
44: Bank 1 (left) heated O2 sensor circuit (lean exhaust indicated)
45: Bank 1 (left) heated O2 sensor circuit (rich exhaust indicated)
46: PASS-key II circuit
47: Knock sensor circuit or control module missing.
48: Mass air flow (MAF) sensor circuit
50: system voltage low
51: EEPROM programming error
53: Sytem voltage high
55: Fuel lean monitor
58: Transmission fluid temp. (TFT) sensor circuit low (High temperature indicated)
59: Transmission fluid temp. (TFT) sensor circuit high (Low temperature indicated)
63: Bank 2 (right) Heated oxygen sensor(HO2S) circuit (open circuit)
64: Bank 2 (right) Heated oxygen sensor(HO2S) circuit (lean exhaust indicated)
65: Bank 2 (right) Heated oxygen sensor(HO2S) circuit (rich exhaust indicated)
66: A/C pressure refrigerant circuit (open or shorted)
67: A/C pressure refrigerant circuit (pressure sensor or A/C clutch circuit problem)
68: A/C relay circuit (shorted circuit)
69: A/C clutch circuit
70: A/C clutch relay driver circuit
72: vehicle speed sensor loss
73: Pressure control solenoind (PCS) circuit (current error)
74: Traction control system (TCS) circuit low
75: Transmission system voltage low
77: Primary cooling fan relay control circuit (not used with V08 option)
78: Secondary cooling fan relay control circuit
79: Trsnsmission fluid overtemp
81: Transmission 2-3 shift solenoid circuit
82: Transmission 1-2 shift solenoid circuit
84: Transmission 3-2 control solenoid circuit
85: Transmission TCC stuck "ON"
90: Transmission TCC solenoid circuit
95: Change oil lamp circuit
96: low oil lamp circuit
97: VSS output circuit

CCM Diagnostic trouble codes (-01)

20: RAP enable circuit (circuit shorted to battery)
21: RAP enable circuit (circuit open or shorted to ground)
22: DIL enable circuit (circuit shorted to battery)
23: DIL enable circuit (circuit open or shorted to ground)
24: Curtesy output circuit (circuit shorted to battery)
25: Curtedy output circuit (circuit open or shorted to ground)
26: VES output circuit (circuit open or shorted to ground)
27: VES output circuit (circuit shorted to battery)
28: VES tracking tracking error (circuit open, shorted to ground, or shorted to battery)
30: "PASS KEY FAULT" telltale circuit (circuit shorted to battery)
31: "PASS KEY FAULT" telltale circuit (circuit open or shorted to ground)
32: Fuel enable circuit (circuit shorted to battery)
33: Fuel enable circuit (circuit open or shorted to ground)
34: Heaflamp enable circuit (circuit shorted to battery)
35: Park lamp enable circuit (circuit shorted to battery)
36: DRL enable circuit (circuit shorted to battery)
37: DRL enable circuit (circuit open or shorted to ground)
38: EEPROM calibration error
39: EEPROM calibration id error
40: Delay pot circuit (circuit shorted to ground)
41: Dealy pot circuit (circuit open or shorted to battery)
42: Key resistor circuit (circuit shorted to ground)
43: Key resistor circuit (circuit open or shorted to battery)
44: Steering wheel sensor circuit (circuit open or shorted to ground)
45: Steering wheel sensor circuit (circuit open or shorted to battery)
46: CCM internal failure
47: Canadian select input error

HVAC Diagnostic trouble codes (-02)

01: Outside air tempurature sensor circuit (circuit open)
02: Outside air tempurature sensor circuit (circuit shorted)
03: In car air tempurature sensor circuit (circuit open)
04: In car air tempurature sensor circuit (circuit shorted)
05: Sun load sensor circuit (circuit open)
06: Sun load sensor circuit (circuit shorted)
10: Air mix motor circuit (circuit open)
11: Air mix motor circuit (circuit shorted)
26: Serial Data Communication (circuit shorted to battery, shorted to ground, or circuit open)
27: Invalid EEPROM detected

SIR Diagnostic trouble codes (-03)

15: Passenger deployment loop resistance high
16: Passenger deployment loop resistance low
17: Passenger deployment loop open
21: Driver deployment loop resistance high
22: Driver deployment loop resistance low
24: Deployment loop voltage low
25: Deployment loop shorted to ignition
26: Driver's deployment loop open
35: ADS (auxiliary discriminating sensor) missing/shorted to ground
36: ADS closed/shorted to voltage
51: Frontal crash detected
52: Crash data area full
61: Lamp circuit failure
62: Redundant lamp circuit failure
71: Internal SDM malfuntion

ABS/TC Diagnostic trouble codes (-04)

21: RF wheel speed sensor circuit malfunction
23: RF wheel speed sensor circuit continuity malfunction
25: LF wheel speed sensor circuit malfunction
27: LF wheel speed sensor circuit continuity malfunction
28: Wheel speed sensor circuit frequency malfunction
31: RR wheel speed sensor circuit malfunction
33: RR wheel speed sensor circuit continuity malfunction
35: LR wheel speed sensor circuit malfunction
37: LR wheel speed sensor circuit continuity malfunction
41: Right front valve solenoid malfunction
42: RH outlet valve solenoid malfunction
45: Left front valve solenoid malfunction
46: LF outlet valve solenoid malfunction
47: ASV prime line solenoid malfunction
48: USV pilot valve solenoid malfunction
51: Right rear valve solenoid malfunction
52: RR outlet valve solenoid malfunction
55: Left rear valve solenoid malfunction
56: LR outlet valve solenoid malfunction
57: TCC disable relay output malfunction
58: EBTCM internal adjuster assembly malfunction
61: Pump motor or pump motor relay malfunction
62: Traction disable switch used or RPM signal malfunction
63: valve solenoid relay malfunction
64: Throttle position signal malfunction
65: Adjuster assembly circuit malfunction
66: Adjuster assembly control malfunction
67: Throttle position sensor comparison malfunction
71: EBTCM internal malfunction
72: Serial data link malfunction
73: Spark retard monitoring malfunction
85: Low voltage.

Ok I'm done...:o

Here's a walkthrough: http://www.troublecodes.net/cadillac/cadbrom.shtml

I read the codes from the heater of my 94 Fleetwood and they are all 3 digits after the 2-digit prefix. I cn't find any reference to 3 digit codes.

For example I got:

00-120
00-122
00-130

04-162

05-10

I haven't even seen a prefox above 04!

Can anyone help me out?

Thanks,

Ray

I was curious about those three digit codes as well, and I'm sure that there are a few other people who might be interested too.

Correct me if I'm wrong, but the 1 prefix just means that the code popped up at an early point in time and was either fixed or went away (miracle?), so the OBD keeps them there as a record.

How about this for those of us who don't have a fancy climate control head that can pull DTC's;

http://www.extreme-check-engine-light-codes.com/E-gmcodesetup-1.jpg

Use a paper clip to jump the terminals and turn the ignition to run, But DO NOT start the engine. The check engine light will begin to flash a two digit code. The first code will be 12 and will be presented as 1 flash/ pause/2flashes.

12 System normal
13 oxygen sensor circuit open
14 coolant sensor high resistance or shorted
15 coolant sensor circuit low or open
16 direct ignition system (DIS) fault in circuit
17 cam position sensor fault
18 crank or cam sensor error
19 crank sensor circuit fault
21 tps sensor out of range
22 tps sensor signal voltage low
23 intake air temp sensor out of range, low
24 vehicle speed (vss) sensor circuit fault
25 air temp sensor sensor out of range, high
26 quad-driver module (computer) circuit #1 fault
27 quad-driver module (computer) 2nd gear circuit
28 quad-driver module (computer) circuit #2 fault
29 quad driver module (computer) 4th gear circuit
31 cam position sensor fault
32 egr circuit fault
33 map sensor signal out of range, high
34 map sensor signal out of range, low
35 idle air control sensor circuit fault
36 ignition system circuit error
38 brake input circuit fault
39 clutch input circuit fault
41 cam sensor circuit fault, igntion control circuit fault
42 electronic spark timing (EST) circuit grounded
43 knock sensor
or electronic spark control circuit fault
44 oxygen sensor lean exhaust
45 oxygen sensor rich exhaust
46 pass-key II circuit or ps.pressure switch circuit fault
47 pcm-bcm data circuit
48 misfire diagnosis
51 calibration error, mem-cal, ecm or eeprom failure
52 engine oil temperature circuit, low temperature indicated
53 battery voltage error or egr or pass-key II circuit
54 egr system failure or fuel pump circuit low voltage
55 a/d converter error or pcm not grounded or lean fuel or frounded reference voltage
56 quad-driver module #2 circuit
57 boost control problem
58 vehicle anti-theft system fuel enable circuit
61 a/c system performance or degraded oxygen sensor signal
62 engine oil temperature high temperature indicated
63 oxygen sensor right side circuit open or map sensor out of range
64 oxygen sensor right side lean exhaust indicated
65 oxygen sensor right side rich exhaust indicated
66 a/c pressure sensor circuit low pressure
67 a/c pressure sensor circuit or a/c clutch circuit failure
68 a/c compressor relay circuit failure
69 a/c clutch circuit head pressure high
70 a/c refrigerant pressure circuit high
71 a/c evaporator temperature sensor circuit low
72 gear selector switch circuit
73 a/c evaporator temperature circuit high
75 digital egr #1 solenoid error
76 digital egr #2 solenoid error
77 digital egr #3 solenoid error
79 vehicle speed sensor (vss) circuit signal high
80 vehicle speed sensor (vss) circuit signal low
81 brake input circuit fault
82 ignition control (IC) 3X signal error
85 prom error
86 analog/digital ecm error
87 eeprom error
99 power management

I personally use this to jump my ALDL

http://memimage.cardomain.com/ride_images/3/2503/2881/31256440052_medium.jpg