2004 Volvo S40 Engine code 91 and A!

2004 VOLVO S40
72,000 MILES • 4 CYL • 2WD • AUTOMATIC
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DAVE34
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  • 2 POSTS
I get a check engine code A1 ECT and 91 Torqe Reduction solenoid. can anybody tell me what they mean.
Dec 22, 2009 at 4:06 PM
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JIS001
  • ✓ASE Certified Mechanic
  • 3,412 POSTS
  • ASE Certified Mechanic
ECM-A1 is for a faulty temperature signal. Check ECT sensor for a leak or corrosion around the sensor harness. If that is ok then most likely the thermostat is either stuck open or opening up too slow. Would recommend you replace the thermostat first since it is the least expensive repair. As for the other code, is the fault a permanent fault or intermittant fault? Also can you have the DSA module scaned for codes as well?
Dec 23, 2009 at 12:22 AM
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DAVE34
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Its permanent once the light comes on it stays on until it is manually cleared.
Dec 23, 2009 at 4:22 AM
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