P2CAC code meaning
DC/DC Converter Temperature Sensor F Circuit Range/Performance
Powertrain system Generic code P2Cxx codes Check engine light
What P2CAC means
P2CAC flags DC/DC converter temperature sensor F as implausible although its signal is electrically valid. With six sensors in one converter the controller has plenty of reference values: after a cold soak all should read close to ambient, and during operation sensor F should rise and fall in step with the load on the part it watches. The Hyundai patent shows that converter software already evaluates temperature differences between sensors, there to tune the switching frequency. No manufacturer documents P2CAC publicly; FCA's Ram 1500 eTorque bulletin 08-037-21 only covers performance codes up to sensor D. CARB requires rationality checks for hybrid component temperature sensors. A sensor detached from its heat sink, drift or outdated software are typical. Sensor E uses P2CA8.
P2CAC at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.3 to 5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2CAC
- MIL on, sometimes after a single drive
- Sensor F reading out of line with the other converter temperatures
Common causes of P2CAC
- PossibleSensor F detached from its heat sink or measuring point
- PossibleSensor F drifting against the other converter sensors
- PossibleOutdated converter or hybrid control software
- Less likelyUneven cooling of the converter, e.g. air in the coolant circuit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Dcdc converter temp sensor fWiring harnessDcdc converter
What each part of P2CAC means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| C | Area: hybrid propulsion. |
| AC | The exact fault in that area. |
What to do next
- Note P2CAC 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 P2CAC
What does P2CAC mean?
P2CAC means "DC/DC Converter Temperature Sensor F Circuit Range/Performance". P2CAC flags DC/DC converter temperature sensor F as implausible although its signal is electrically valid. It is a generic code, so it means the same on every make.
Is it safe to drive with P2CAC?
Drive gently and only to a workshop. With P2CAC the car can go into limp mode (reduced power) to protect itself.
Will P2CAC fail an emissions test?
Yes, it can. P2CAC 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 P2CAC to fix?
Difficulty: workshop only. A typical repair takes 0.3 to 5 hours of work. This is a job for a workshop.
Will P2CAC clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.