P0690: ECM/PCM Power Relay Sense Circuit High
What Does P0690 Mean?
P0690 is a diagnostic trouble code indicating: ECM/PCM Power Relay Sense Circuit High. This code relates to the computer and output circuits system. It has been reported in NHTSA complaints across 1 different vehicle models.
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"INITIALLY RADIO STAYED ON AFTER LEAVING CAR ONCE. LATER THE CAR WOULD NOT START EVEN THOUGH BATTERY WAS FAIRLY NEW. MECHANIC DIAGNOSED 2 CODES (P062B CONTROL MICRO PROCESSOR AND P0690 RELAY CIRCUIT) RELATED TO ECM. MECHANIC RESET THE ECM AND TRIED RUNNING CAR BUT CODES CAME BACK AGAIN. NEW ECM H"
— Gmc Terrain owner, 01/12/2017
Source: NHTSA Complaints Database
Most Reported Vehicles for P0690
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | GMC TERRAIN |
Frequently Asked Questions
Does this mean my car's computer is bad?
How much does an ECM replacement cost?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.