P063F code meaning
Auto Configuration Engine Coolant Temperature Input Not Present
Powertrain system Generic code P06xx codes Check engine light
What P063F means
Some modules configure themselves at start-up by detecting which inputs are present. P063F means the module expects a coolant temperature input but does not detect it during this self-configuration. It differs from the circuit codes P0117/P0118 (signal low/high) and the plausibility codes P0116, P0125 and P0128, which judge a present signal. No manufacturer document or patent available to us describes this check; the explanation is derived from the J2012 wording. CARB requires the coolant temperature sensor to be monitored for circuit, range and warm-up. Possible causes are an unplugged NTC sensor, an open wire or software for a different vehicle. Expect a substitute temperature, a constantly running fan, a dead temperature gauge and poorer cold starts.
P063F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P063F
- Check engine light
- Radiator fan runs constantly
- Temperature gauge not working
- Poor cold start, higher consumption
Common causes of P063F
- PossibleCoolant temperature sensor not connected, connector or wire open
- PossibleWrong module software or variant
- Less likelyFaulty sensor
- Less likelyInternal module fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine coolant temperature sensorSensor wiringEngine control module
What each part of P063F means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| 3F | The exact fault in that area. |
What to do next
- Note P063F and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P063F
What does P063F mean?
P063F means "Auto Configuration Engine Coolant Temperature Input Not Present". Some modules configure themselves at start-up by detecting which inputs are present. It is a generic code, so it means the same on every make.
Is it safe to drive with P063F?
Drive gently and only to a workshop. With P063F the car can go into limp mode (reduced power) to protect itself.
Will P063F fail an emissions test?
Yes, it can. P063F is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P063F to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P063F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.