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OBD Code P0790

Normal/Performance Switch Circuit

CodeP0790
DescriptionNormal/Performance Switch Circuit
Possible CausesFaulty drive mode switch|Wiring issue
SymptomsCannot change drive mode|Stuck in one mode
SystemTransmission

What Does P0790 Mean?

Normal/Performance Switch Circuit. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the transmission.

Code Breakdown

P = Powertrain code

0 = Generic (SAE standard)

How to Fix P0790

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Check transmission fluid level and condition — dark, burnt-smelling fluid indicates internal wear.
  2. Inspect the transmission wiring harness and connectors (especially the main connector at the case).
  3. Check the transmission range sensor (PRNDL switch) for proper operation.
  4. Test solenoids by commanding them with a scan tool.
  5. Check for TSBs — many transmission codes are resolved with a TCM software update.
  6. If shifting issues persist after electrical checks, internal transmission repair may be needed.
  7. Clear codes and test drive through all gears.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P0790 serious?

P0790 is generally considered a low-severity code. While it should still be addressed, it is unlikely to cause immediate safety concerns. However, ignoring it long-term may lead to higher emissions or reduced fuel economy.

Can I clear P0790 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return, usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P0790?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool, not just reading the code, is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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