ECU & Outputs Trouble Codes: List & Fixes

P0562 Powertrain The engine computer sees too little supply voltage – usually a charging, battery or ground… Moderate P0606 Powertrain The engine computer failed its own internal self-test – check its power and grounds before… Moderate P1000 Ford · Powertrain Ford's computer hasn't finished all its self-tests yet. It's a status message, not a fault. Minor

P0000 Powertrain P0000 is not a fault: the scanner found no stored code. It is a placeholder that means… Minor P0217 Powertrain The engine overheated. Stop driving: continuing can warp the head, blow the head gasket… Critical P0219 Powertrain The engine was spun faster than its maximum allowed rpm, usually by a missed shift or wheelspin. Moderate P0480 Powertrain Fault in the circuit that switches the main radiator fan – the engine can overheat in traffic. Moderate P0481 Powertrain The second fan output – a second fan or the high-speed stage – has a circuit fault; A/C suffers… Low P0562 Powertrain The engine computer sees too little supply voltage – usually a charging, battery or ground… Moderate P0600 Powertrain The engine computer lost a dedicated data link to another module, most often the transmission… Moderate P0601 Powertrain The engine computer's stored software failed its checksum test at start-up – usually a reflash… Moderate P0602 Powertrain The engine computer has no valid or complete software – typical after a module swap or a failed… Moderate P0603 Powertrain The engine computer lost its learned memory – usually after a battery disconnect or a bad… Low P0604 Powertrain The engine computer's working memory failed a read/write test – rarely a software issue, often… Moderate P0605 Powertrain The memory holding the engine computer's program failed its integrity test – try one reflash… Moderate P0606 Powertrain The engine computer failed its own internal self-test – check its power and grounds before… Moderate P0607 Powertrain A general internal performance check in the engine computer failed – supply, grounds… Moderate P0610 Powertrain The engine computer's vehicle configuration is missing or doesn't match the car – usually after… Low P061B Powertrain The ECM's safety monitor disagreed with its own engine torque calculation – often bad input… Moderate P0620 Powertrain The engine computer found a fault in the wire or signal it uses to command alternator output. Moderate P0621 Powertrain A fault in the alternator's 'L' circuit – the line behind the charge light or the ECM's turn-on… Moderate P0622 Powertrain The alternator's field control or field feedback circuit is faulty – output may drop out… Moderate P0625 Powertrain The PCM sees the alternator's field-monitor signal stuck low – usually the regulator, its plug… Moderate P0626 Powertrain The alternator reports a field signal stuck at or near full output – battery, alternator… Moderate P0627 Powertrain The PCM's fuel pump command line has no complete circuit – a dead relay coil, open wire, fuse… Moderate P0628 Powertrain The fuel pump control wire is pulled toward ground – a chafed wire, shorted relay coil or wet… Moderate P0629 Powertrain Battery voltage is leaking into the fuel pump control line – a short, corrosion bridge… Moderate P0630 Powertrain The engine computer has no VIN stored, or one that doesn't match the car – a classic after… Low P0641 Powertrain The PCM's shared 5-volt supply 'A' is missing or out of range – often one shorted sensor… High P0642 Powertrain The PCM's 5-volt supply 'A' is being pulled below spec, usually by a short to ground in one… High P0651 Powertrain The PCM's second 5-volt sensor supply is out of range – usually a pedal, throttle or pressure… Moderate P0685 Powertrain The engine computer can't switch its own main power relay – open coil, blown fuse or broken… High P0686 Powertrain The main relay control line is being pulled to ground – usually a shorted relay coil… Moderate