Skip the auto shop - Our mechanics make house calls

Q: OBD-II scanner read code P0108

asked by on

After reading the code on the OBD II auto scanner as P0108, I replaced the MAP sensor. After that I reset the code after installing new one. I continued by testing the OEM on the old one, plus the new one, and they both read 1 per OEMs meter. They are both looking good, however it did not fix the problem. The service engine light is still coming on, plus the same code, P0108 is also still shows. To explain more details, the service light had not come on immediately. I had cleared the code and then I turned the ignitions switch to On; however, I did not start my car. After waiting for 10 seconds, then I turned the ignition switch off again. After plugging in the OBD2 scan tool, I scanned for codes but there were none. After turning off the car, the code P0108 appeared once more. It does not seem that the ECM will be going out. Please give me your advice as to what I should do. Thanks.

A: Hello. The MAP sensor reading on a scanner ...

Hello. The MAP sensor reading on a scanner should read about 1.0 to 1.5 volts at idle and 4.5 to 4.8 volts at wide open throttle. The MAP should read 4.8 volts or more when you have the key on engine off. If either sensor is not within these specs, then replace have it replaced. Once you install the sensor, then clear the codes and road test the vehicle to see if code returns. If it returns, then you will need to have the entire pinpoint test done to check the wiring and ECM for problems.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: When accelerating, car backfires or turns off

Hello. There is a possible recall for the ignition control module on your vehicle. You will need to contact a GM dealer and see if your vehicle is on the recall for the recall 03v231000 ignition control module failure. The...

Q: How do I know that my OBD system is working right?

The OBD system on your vehicle is a self-monitoring system. The Powertrain Control Module monitors and controls all of the systems and functions that regulate fuel, ignition, emissions, and engine cooling as well as having some minor control over air...

Q: OEM-sized pipe exhaust flow

As long as you use the basic same size, it won't affect anything, but you want to stick to OEM size on that Audi, because the exhaust flow is based on the diameter of the pipe and if you put...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...