Fuel and air

P0069 — MAP Sensor and Barometric Pressure Correlation Fault

Severity: medium Drive with care, to a shop

What P0069 means

The engine control module compares intake manifold pressure from the MAP sensor with atmospheric pressure. With the engine off, or at wide-open throttle, the two readings should be nearly equal. If they differ by more than allowed, the ECM sets P0069 because it can't trust its engine load and fuel calculations. Barometric pressure comes from a separate BARO sensor or from the MAP sensor at key-on.

Symptoms

  • Check engine light on
  • Reduced power and sluggish acceleration
  • Rough or unstable idle
  • Worse fuel economy
  • Hesitation when accelerating
  • Hard starting in some cases

Possible causes

  1. Failed or dirty MAP sensor
  2. Faulty BARO sensor, if the vehicle has a separate one
  3. Damaged wiring, corroded connector pins or a poor sensor ground
  4. Intake or vacuum leak, such as a cracked or disconnected hose
  5. Blocked or damaged port or hose feeding pressure to the sensor
  6. ECM software issue (rare)

How to diagnose

  1. Scan for all codes and freeze-frame data, and look for related MAP, MAF or throttle codes
  2. With key on and engine off, compare MAP and BARO readings on a scan tool: both should be close to local atmospheric pressure
  3. Inspect the MAP sensor connector and harness for corrosion, chafing or oil contamination
  4. Check the 5 V reference, ground and signal wires with a multimeter
  5. Inspect the intake tract and vacuum hoses for leaks, and smoke test if needed
  6. At idle, confirm the MAP reading matches engine vacuum using a vacuum gauge
  7. Compare against a known good sensor or test it to factory specs
  8. Check for ECM software updates

Common fixes

  • Replace the MAP sensor
  • Replace the BARO sensor if separate
  • Repair wiring and clean or replace the connector
  • Fix intake and vacuum leaks and replace damaged hoses or gaskets
  • Update or replace the ECM only as a last resort

Questions and answers

What does code P0069 mean?

The ECM found that intake manifold pressure from the MAP sensor doesn't agree with barometric pressure. The usual causes are the MAP sensor itself, its wiring or an intake leak.

Can I drive with P0069?

Short, careful trips such as getting to a shop are usually fine. The engine may run poorly and use more fuel, so don't put off diagnosis.

How do I clear P0069?

You can erase it with a scan tool, but it will return unless the cause is fixed. Check the MAP sensor, wiring and intake for leaks first.

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.