Ask Your Car Question. Car Experts Answer You ASAP.

(Not a Car Question?)

2002 trailblazer code # 0495 fan speed hi. where is sensor ...

Sent to Car Experts April 26 12:20 PM

2002 trailblazer code # 0495 fan speed hi. where is sensor location

 

Optional Information:
2002 Chevrolet trailblazer 4.2 liter

Already Tried:
i have only retrived engine code p0495

Customer (name blocked for privacy)
Status:  Closed   Value: $25
Answer
April 26 12:30 PM (9 minutes and 49 seconds later)
         
ACCEPTEDCheck Mark

Hope this helps. Please click accept for me. ThanksImages available only to Customers.

The cooling fan relay sends a pulse width modulation (PWM) signal (12-14 volts) to the cooling fan by the cooling fan clutch supply voltage circuit. The power train control module (PCM) uses the PWM signal, which controls the speed of the cooling fan by controlling the position of the oil control valve inside the clutch. If the cooling fan RPM is to high when the PCM is commanding 0%, DTC P0495 will set.

The sensor is built into the fan clutch the connector is at the top of the fan shroud. I see this a lot it is usually the fan clutch that causes the problem. There is a bulletin that states replace the clutch and reprogram the pcm.

You really need a G.M. scan to test the clutch to see if it is the fault.



PLEASE -Remember that your Expert will not be paid until you accept an answer and complete the process. Please leave "FEED BACK".
Picture
Danny -- Shop foreman -- 99% Positive Feedback on 331 Car Accepts
Senior Master Subaru, G.M.Cert.,Honda cert., Dodge Cert., Ford Cert., 2 ASE Master cert.15 yrs exp.
Think you can answer this question?
Login or Become an Expert

Related Answers

 

DISCLAIMER: You acknowledge that any information you may obtain from individuals you contact through use of the JustAnswer service comes from those individuals, not from JustAnswer, and that JustAnswer is not in any way responsible for any of the information these third parties may supply. The site and services are provided "as is" with no warranty and no representations are made regarding the qualification of an Expert. Responses and comments on JustAnswer are for general information and are not intended to substitute for informed professional advice (such as medical, legal, investment or accounting) and do not establish a professional-client relationship. JustAnswer is not intended or designed to address EMERGENCY QUESTIONS which should be directed immediately by telephone or in-person to qualified professionals. Please carefully read the Terms of Service.

JustAnswer > Car Repair