ECM Error Codes

13 Oxygen (O2) Sensor – signal stays low (“lean”) during warm engine cruise
14 Coolant Temperature Sensor (CTS) – signal voltage is low
15 Coolant Temperature Sensor (CTS) – signal voltage is high
16 High battery voltage
OR Direct Ignition System (DIS) fault – line open or shorted to ground
17 RPM signal problem
21 Throttle Position Sensor (TPS) – signal voltage is high during engine idle or deceleration
22 Throttle Position Sensor (TPS) – signal voltage is low during engine idle
OR Fuel cutoff relay circuit – open or shorted to ground
23 Manifold Air Temperature (MAT) Sensor – signal voltage is low
OR Throttle Position Sensor (TPS) error
24 Vehicle Speed Sensor (VSS) – signal is constant (no pulsing) during engine deceleration
25 Manifold Air Temperature (MAT) Sensor – signal voltage is low
OR Vacuum Switching Valve Circuit open or shorted to ground
OR ATS Sensor – signal voltage is high
26 Quad driver module
27 2nd gear switch
28 3rd gear switch
29 4th gear switch
31 Manifold Absolute Pressure (MAP) Sensor – signal voltage is low OR Fuel injector OR CAM diagnostic
OR Governor Malfunction
OR Wastegate overboost
OR Wastegate Eletrical Signal – open or shorted to ground
32 Barometric Pressure (BARO) Sensor circuit failure
OR Exhaust Gas Recirculation (EGR) valve diagnostic switch – closed during engine startup or open when EGR flow requested by ECM
OR EGR / EVRV (Electronic Vacuum Regulator Valve)
33 Mass Air Flow (MAF) Sensor – signal voltage or frequency is high during engine idle
OR Manifold Absolute Pressure (MAP) Sensor – signal voltage is high during idle [***Note: Engine mis-fire or unstable idle may cause this code]
34 Mass Air Flow (MAF) Sensor – signal voltage or frequency is low during engine cruise
OR Manifold Absolute Pressure (MAP) Sensor – signal voltage is low during ignition on
35 Idle Air Control (IAC) system problem – can not set desired RPM
36 Mass Air Flow (MAF) Sensor – burn off circuit problem
OR Transmission shift problem
OR Direct Ignition System (DIS) fault – extra or missing pulses in Electronic Spark Timing (EST) signal
38 Brake switch circuit failure
39 Torque Converter Clutch (TCC) circuit fault
41 Cam Sensor (CAM) failure
OR Cylinder Select Error
OR Tach Input Error – no reference pulses during engine run
42 Electronic Spark Timing (EST) circuit – open or shorted to ground during engine run
OR Direct Ignition System (DIS) fault – bypass circuit open or shorted ground during engine run
OR Fuel Cutoff Relay Circuit – open or shorted to ground
43 Electronic Spark Timing (EST) Circuit – low voltage detected
44 Lean exhaust indication – Oxygen (O2) Sensor voltage stays low after on or two minutes of engine run
45 Rich exhaust indication – Oxygen (O2) Sensor voltage stays high after one minute of engine run
46 Vehicle Anti-Theft Sytem (VATS) failure
OR Power Steering Switch failure
47 Electronic Control Module (ECM) computer circuit problems – Universal Asynchronous Receiver / Transmitter (UART) link
48 Misfire
49 Vacuum leak
51 Electronic Control Module (ECM) computer circuit problems – Programmable Read-OnlyMemory (PROM)
OR Checksum errors
52 Electronic Control Module (ECM) computer circuit problems – fuel calpac missing, analog todigital converter (A/D) error quad driver module (QDM) fault
OR Oil Temperature Sensor – signal voltage is low
53 Over voltage condition
OR Exhaust Gas Recirculation (EGR)
OR Voltage reference error
OR Vehicle Anti-Theft System (VATS) problems
Number Description
54 Low fuel pump voltage
OR Fuel pump relay
OR Quad Driver Module (QDM) output failure
55 Electronic Control Module (ECM) computer circuit problems – ECM failure, Serial Bus error, SAD error
OR Fuel lean malfunction
56 Corrosivity / Add Collant
OR Port Throttle System Vacuum Sensor problems
58 Vehicle Anti-Theft System (VATS) problem
61 Oxygen (O2) Sensor degraded
OR Port Throttle System error
OR Cruise control problems – vent solenoid circuit
62 Gear switch imput diagnostics
OR Oil Temperature Sensor – signal voltage is high
OR Cruise Control Problems – vacuum solenoid circuit
63 Manifold Absolute Pressure (MAP) Sensor – signal voltage is high
OR Small EGR failure
OR Right Oxygen (O2) Sensor failure
64 Manifold Absolute Pressure (MAP) Sensor – signal voltage is low
OR Medium EGR failure
OR Right Oxygen (O2) Sensor – lean condition indicated
65 Large EGR failure
OR Injector Peak / Hold Diagnostic
OR Right Oxygen (O2) Sensor – rich condition indicated
OR Cruise Control Position Sensor Problem
66 Electronic Control Module (ECM) computer circuit problem – internal reset occurred
67 Cruise Control – switch circuit problems
68 Cruise Control – system circuit problems
69 Air Conditioner Pressure Switch – circuit problems
88 Electronic Control Module (ECM) computer circuit problem – internal reset occured

 

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