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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15133
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I'm getting a P1791 code that only happens when it rains,

Customer Question

I'm getting a P1791 code that only happens when it rains
JA: Just to clarify, what's the exact code? And have you tried to reset it?
Customer: P1791 yes I did
JA: What is the model/year of your Chevy?
Customer: 2005
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Equinox
JA: Anything else you want the mechanic to know before I connect you?
Customer: I had the TCM replaced already
Submitted: 8 days ago.
Category: Chevy
Expert:  david craig replied 8 days ago.

Hi Im David, theres a connector behind the pillar that is suject to moisture/corrosion. Disconnect and inspect the instrument panel/body inline connector (black 40-pin electrical connector). If necessary, replace damaged terminals and apply dielectric grease to the connector.

Important: If no corrosion or bent terminals are found, proceed to Step 7 and follow trouble code diagnostics in the service manual or SI.

  1. Starting at the left hinge pillar garnish, pull upward to disengage the attaching clips.
  2. Reach under the instrument panel and pull upwards to disengage the additional clips and remove the molding from the vehicle.

  3. Disconnect the instrument panel/body inline connector (black 40-pin electrical connector).
  4. Inspect the connector for bent or corroded terminals.
  5. Remove any bent or corroded pins from the connector.
  6. Install the new terminal cut lead (verify correct size using connector/harness face views and electrical schematics in the appropriate service manual or SI).
  7. Pack the connector terminals with dielectric grease in order to prevent any further corrosion.
  8. Connect the instrument panel/body inline connector (black 40-pin electrical connector).
  9. Install the molding.
Expert:  david craig replied 6 days ago.

checking in to see how its going

Expert:  david craig replied 21 hours ago.

were you able to have it taken care of?