Fan 2 not cooling your vehicle? Low control circuit can overheat the engine. Scan P0693, test wiring, then replace or reprogram the fan module today.

Fan 1 control circuit high in your vehicle can cause overheating; check the warning, scan the fan module, and have it repaired or reprogrammed today.

Fan 1 not turning on in your vehicle? P0691 (Fan 1 Control Circuit Low) can overheat the engine. Scan wiring, test fan module, and reflash or replace it.

Power relay circuit high on your vehicle? It can shut down the ECM/PCM, risking engine control loss. Scan P0690, test the relay, and consider reprogramm...

Engine won’t start or stalls on your vehicle – ECM/PCM Power Relay Sense Circuit Low means loss of control power. Scan, test relay, reprogram or replace.

Power relay fault cuts ECM/PCM power on your vehicle—engine may stall or not start. Scan P0688, test the relay circuit, then repair or reprogram.

Check‑engine light warning on your vehicle? ECM/PCM Power Relay Control Circuit high can cause loss of engine control. Scan and inspect relay or PCM now.

Low power relay warning on your vehicle? P0686 means ECM/PCM power relay circuit low—loss of control module. Scan, test relay, reprogram/replace.

Power‑relay failure causes no‑start or stalling in your vehicle—ECM/PCM power circuit open. Scan, test the relay, and replace the module quickly.

Hard start on your vehicle? P0684 means Glow Plug Control Module‑1 to PCM communication out of range—scan, test wiring, then reprogram or replace.