Fuel and air

P011D — Charge Air / Intake Air Temperature Sensor Correlation, Bank 2

Severity: medium Drive with care, to a shop

What P011D means

The PCM compares the intake air temperature (IAT) sensor with the charge air temperature (CAT) sensor on bank 2. Under certain conditions, such as a fully cold engine, the two readings should be close to each other. If they differ by more than the allowed amount, the PCM sets a correlation fault and may substitute default temperature values.

Symptoms

  • Check Engine light on
  • Reduced power
  • Rough idle or hesitation
  • Worse fuel economy
  • Hard starting, especially when cold

Possible causes

  1. Failed intake air temperature (IAT) sensor
  2. Failed charge air temperature (CAT) sensor
  3. Open, short or poor connection in the sensor wiring or connectors
  4. Restricted or dirty intercooler or charge air piping
  5. Boost or air leaks in the intake tract
  6. PCM software issue or PCM fault (rare)

How to diagnose

  1. Scan for all codes and review freeze frame data, looking for other temperature or boost codes
  2. Compare IAT and CAT readings on a scan tool with a fully cold engine; they should nearly match
  3. Inspect bank 2 sensor connectors and wiring for corrosion, damage and chafing
  4. Test signal and ground circuits and check sensor reference voltage
  5. Measure sensor resistance and compare it to the spec for the current temperature
  6. Inspect the intercooler, pipes and clamps for restrictions, oil and leaks
  7. Check for PCM software updates for your vehicle

Common fixes

  • Replace the faulty IAT or CAT sensor
  • Repair the wiring or replace a damaged connector
  • Clean the intercooler and intake path, and fix leaking pipes
  • Reflash or replace the PCM if it is confirmed faulty

Questions and answers

What does P011D mean?

The PCM sees that the bank 2 intake air and charge air temperature sensors report noticeably different values when they should be close. A bad sensor or its wiring is the most common cause.

Can I drive with P011D?

For a short time, yes, but power may drop and fuel use may rise. Have the sensors and wiring checked soon.

How do I tell a bad sensor from a wiring problem?

Compare the readings on a cold engine and measure the sensor's resistance. If the sensor is fine, test the circuit and inspect the connector.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.