Category: Chevrolet

P1244 Chevrolet Alternator Load Input Failed High

P1244 Chevrolet Alternator Load Input Failed High Possible causes GEN-MON circuit short to B+. GEN-COM circuit short to B+. B+ open prior to start-up. Open GEN-COM prior to start-up. Open I-line prior to start-up. Damaged PCM. Tech description Verify the battery voltage is 14.5 volts. Verify the generator/regulator has the correct part number. Symptoms –…

P1245 Chevrolet Alternator Load Input Failed Low

P1245 Chevrolet Alternator Load Input Failed Low Possible causes GEN-COM circuit short to GND. GEN-MON circuit short to GND. Open B+ wire during operation. Low system voltage. Broken generator belt. Damaged generator/regulator assembly. Damaged PCM. Tech description Verify the battery voltage is 14.5 volts. Verify the generator/regulator has the correct part number. Symptoms – Engine…

P1238 Chevrolet Turbocharger Control valve

P1238 Chevrolet Turbocharger Control valve Possible causes – Air leakage after turbocharger – Hoses between turbocharger and turbocharger control valve are loose, blocked or damage – Hoses between turbocharger control valve and pressure servo are loose, blocked or damage – Faulty turbocharger control valve – Faulty boos pressure control valve pressure servo – Sticking boost…

P1235 Chevrolet Fuel Pump Control Out Of Range

P1235 Chevrolet Fuel Pump Control Out Of Range Possible causes – Faulty Fuel Pump Drive Module (FPDM)– FPDM harness is open or shorted– FPDM circuit poor electrical connection– Faulty Powertrain Control Module (PCM) Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1235 Chevrolet Description The P1235 Chevrolet code indicates the Fuel Pump…

P1237 Chevrolet Injector Circuit Cylinder 6 Intermittent

P1237 Chevrolet Injector Circuit Cylinder 6 Intermittent Possible causes – Faulty Fuel Pump Driver Module (FPDM)– Fuel Pump Driver Module (FPDM) harness is open or shorted– Fuel Pump Driver Module (FPDM) circuit poor electrical connection– Faulty fuel pump What about the obd code? Fuel pump driver module has detected a fault in the fuel pump…

P1233 Chevrolet Fuel Pump Driver Module Off Line

P1233 Chevrolet Fuel Pump Driver Module Off Line Possible causes Inertia fuel shutoff (IFS) switch needs to be reset. Open FPDM ground circuit. Open circuit to FPDM PWR RLY. Open FPDM PWR circuit. Open or shorted FPM circuit (engine should start). Damaged IFS switch. Damaged FPDM PWR RLY. Damaged FPDM. Damaged PCM. Also for Mustang:…

P1229 Chevrolet Sensor Power Supply Circuit Shorted

P1229 Chevrolet Sensor Power Supply Circuit Shorted Possible causes – Check harness body ground– Faulty Accelerator Pedal Position (APP) sensor– Faulty Power Steering Pressure (PSP) sensor– Faulty Refrigerant Pressure sensor– Faulty EVAP Control System Pressure sensor Tech description Start by inspecting the connections of the harness to the body grounds. What about the obd code?…