VOLVO
ECM-042D - Rear temperature sensor, catalytic converter. Signal too high
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (10)
- Volvo C30 (2007–2013)2007Engine D4204T only
- Volvo C30 (2007–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo C70 (2006–2013)2008Engine D4204T only
- Volvo C70 (2006–2013)2009–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo S40 (2004–2013)2005–2006Engine D4204T, D4204T2 only
- Volvo S40 (2004–2013)2007Engine D4204T only
- Volvo S40 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
- Volvo V50 (2004–2013)2005–2006Engine D4204T, D4204T2 only
- Volvo V50 (2004–2013)2007Engine D4204T only
- Volvo V50 (2004–2013)2008–2010Engine D4204T only · Transmission MMT6, MPS6 only
What does this fault code mean?
The control module compares the signal from the rear temperature sensor in the catalytic converter with a calculated value and sets the fault if the signal is too high. The fault is checked when the ignition is switched on. The causes are wiring to the sensor that is shorted to voltage, or a damaged sensor.
Possible causes
- Wiring to the temperature sensor short-circuited to voltage
- Damaged temperature sensor
What you can do
- 1Read out the fault code, erase it and check whether it returns at the next ignition on
- 2Switch off the ignition and check the rear sensor connector for loose connections and oxidation
- 3Use a multimeter to check that the signal wire to the sensor is not shorted to voltage
- 4Also check that the supply wire is not shorted to voltage, and look for chafed wires near the exhaust pipe
- 5If the fault remains, have a workshop with diagnostic equipment check the sensor and the wiring
Symptoms you may notice1
- The check engine lamp lights or behaves abnormally
General guidance for car owners. Diagnosis on the car can point to a different cause.