What does fault code ECM-P208029 mean?

Diagnostic fault code details for ECM-P208029 (Volvo S80 (2007–), Volvo V70 (2008–), Volvo XC60 (2009–)). Repair service at OBD Tuning.

VOLVO

ECM-P208029 - Exhaust Gas Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1. General Signal Failures. Signal signal invalid

System

Engine Control Module (ECM)

Volvo models this fault code applies to

Applies to the following models:

5 models

S80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–), XC90 (2003–)

Show models by year and engine (6)

What does this fault code mean?

The engine control module (ECM) monitors the exhaust gas temperature and sets the code when the reading from the temperature sensor ahead of the catalytic converter is wrong. The car may then run with poorer performance, because a calculated value is used instead of the sensor signal.

Possible causes

Trouble code ECM-P054600 can cause this code
Signal wire short-circuited to voltage
Earth lead short-circuited to voltage
Damaged temperature sensor at the catalytic converter
Contact resistance, oxidation or open circuit in the connections
Trouble code ECM-P054500 can cause this code

What you can do

1Check that the fuses are intact
2Twist and wiggle the wiring at the sensor and see whether the signal drops out
3Use a multimeter to check that the signal wire has no contact with voltage or ground
4If you have a diagnostic tool: see in live data whether the sensor value follows the engine warming up
5If the fault remains, have a workshop measure the sensor resistance and repair the wiring as needed

Symptoms you may notice2

The car runs with poor performance and lacks power
The engine hesitates, surges or runs unevenly, especially during acceleration

What the fault can affect1

A calculated value is used instead of the sensor signal

General guidance for car owners. Diagnosis on the car can point to a different cause.