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Motor (P)
The wake-up line that brings a sleeping ECU back from low-power mode is open. Many networks use a dedicated ha…
The wake-up input on the control module reads stuck low — usually a short to ground or a permanently asserted …
The wake-up input reads above the expected range — typically a short to battery voltage. The module sees a per…
After a long key-off soak both the EGR temperature sensor and the charge-air cooler outlet temperature sensor …
After a long key-off soak the AdBlue/DEF tank temperature and the fuel tank temperature should read close to e…
The pre-catalyst NOx sensor on bank 1 (sensor 1) reacts too slowly when NOx in the exhaust drops from a high t…
The post-catalyst NOx sensor on bank 1 (sensor 2) reacts too slowly when NOx in the exhaust drops from a high …
On systems that inject HC dosing fuel or AIR-assisted reductant into the aftertreatment, a purge valve clears …
The aftertreatment HC dosing or reductant purge valve is stuck closed. The ECM commands purge but the line is …
General electrical fault in the control circuit of the aftertreatment fuel/air purge valve. The ECM cannot dri…
The valve coil is electrically intact, but the response (current rise time, return-current decay, position fee…
The control circuit of the aftertreatment purge valve reads stuck low — usually a short to ground or a failed …
The control circuit of the aftertreatment purge valve reads stuck high — typically a short to battery voltage …
The PM (soot) sensor heater is driven by a current-limited stage so it can burn off accumulated soot before ea…
The ECM identifies the installed particulate filter A as the wrong part — backpressure signature, regeneration…
The ECM identifies the installed SCR catalyst as the wrong part — NOx conversion efficiency, NH3 storage capac…
The temperature of the AdBlue/DEF in the dosing system exceeds the safe limit — risk of thermal decomposition …
The L-terminal feedback line from the alternator (charging warning lamp circuit) reads below the lower limit. …
The L-terminal feedback from the alternator reads above the upper limit — short to supply or open ground side.…
The ECU detects an out-of-range charging system voltage without specifying high or low. Indicates a generic ch…
The ECU detects that battery voltage during operation stays below the regulated target. The alternator output …
The ECU detects a battery voltage above the regulated upper limit. The voltage regulator is not limiting alter…
The ECM/PCM monitors the main switched battery feed (typically terminal 15 / ignition-switched supply via the …
The switched-battery input to the ECM/PCM is present, but the level or transient behaviour is out of plausibil…