Code Definition

P1122 — Ignition Control Module 4X Circuit, or TPS Out of Range

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: GM

About P1122

P1122 is a manufacturer-specific powertrain diagnostic trouble code recorded for GM vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1122 is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1122 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This General Motors specific code covers two related fault areas, the Ignition Control Module (ICM) 4X reference circuit and the Throttle Position Sensor (TPS) signal, and it is the low voltage counterpart to P1121. The 4X reference is a crankshaft based signal of four pulses per revolution that the ignition module passes to the Powertrain Control Module (PCM) for ignition timing, while the TPS reports throttle plate angle as a variable voltage. P1122 sets when the PCM sees the TPS signal voltage below its valid operating range, usually an intermittent low or dropout reading, or detects a prob...

Join TaT to view the complete code information and diagnostic details.

Quick Facts