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General Motors Diagnostic Codes, Trouble Codes and Descriptions. Throttle Body Injection.

WesTech Auto

Diagnostic Codes

General Motors

Most Throttle Body Injection Vehicles
Except GEO Metro
13 Oxygen Sensor Circuit.
14 Coolant Temperature Sensor Circuit.
15 Coolant Temperature Sensor Circuit.
21 TPS Signal Voltage High.
22 TPS Signal Voltage Low.
23 Manifold/Intake Air Temperature Sensor.
24 Vehicle Speed Sensor Circuit.
25 Manifold/Intake Air Temperature Sensor.
26 Quad-Driver Module Circuit.
31 Governor Malfunction.
32 EGR System Failure.
33 Manifold Absolute Pressure (MAP) Sensor Circuit, Voltage High.
34 Manifold Absolute Pressure (MAP) Sensor Circuit, Voltage Low.
35 Idle Air Control Circuit.
41 Ignition Control Circuit.
42 Electronic Spark Timing Circuit.
43 Electronic Spark Control Circuit.
44 Oxygen Sensor Circuit is Lean.
45 Oxygen Sensor Circuit is Rich.
46 PASS Key Circuit.
51 ECM, PROM or MEM-CAL Error.
52 Fuel CALPAK Missing.
53 System Over Voltage (Except 5.0L & 5.7L Camaro & Firebird).
53 Anti-Theft System & PASS Key Circuit (5.0L & 5.7L Camaro & Firebird).
54 Fuel Pump Circuit.
55 Faulty Electronic Control Module. Replace ECM.
The Diagnostic Codes and Explanations are derived from Manufacturer supplied Technical Data. WesTech does not guarantee the accuracy of this Information nor can it be held liable for providing it.
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