P006B code meaning
MAP - Exhaust Pressure Correlation
Powertrain system Generic code P00xx codes Check engine light
What P006B means
On engines with an exhaust pressure sensor, mostly turbocharged diesels, the control module checks whether manifold pressure and exhaust back pressure fit each other, for example with the engine stopped, when both should be at ambient pressure. P006B is set when they do not. No manufacturer description of this code was found; the explanation follows the general rule for plausibility checks of input sensors. Suspects are the exhaust pressure sensor or its sooted hose, and the manifold pressure sensor. Each sensor can be electrically fine on its own; regulations require such plausibility checks for input sensors with a code of their own.
P006B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 1 hours
- Clears after repairAfter a drive cycle
Symptoms of P006B
- Check engine light on
- Often no further symptoms
Common causes of P006B
- PossibleExhaust pressure sensor faulty or its hose sooted or blocked
- PossibleManifold pressure sensor faulty
- Less likelyEGR or turbocharger fault distorting pressures
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Exhaust pressure sensorExhaust pressure sensor hoseManifold absolute pressure sensor
What each part of P006B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| 6B | The exact fault in that area. |
What to do next
- Note P006B 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 P006B
What does P006B mean?
P006B means "MAP - Exhaust Pressure Correlation". On engines with an exhaust pressure sensor, mostly turbocharged diesels, the control module checks whether manifold pressure and exhaust back pressure fit each other, for example with the engine stopped, when both should be at ambient pressure. It is a generic code, so it means the same on every make.
Is it safe to drive with P006B?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P006B fail an emissions test?
Yes, it can. P006B 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 P006B to fix?
Difficulty: medium. A typical repair takes 0.5 to 1 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P006B 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.