JC Landry, Author at eManualOnline Blog

JC Landry

JC is the Senior Editor at eManualOnline.com, GarageSpot.com, and Drive-My.com, as well as the Webmaster of TheMechanicDoctor.com, only to name a few. He's been a certified Master Mechanic for 15 years, working for various car dealers and specialized repair shops before turning towards blogging about cars and EVs in the hope of helping the next generation of automotive technicians. He also loves cats, Johnny Cash and Subarus.

P0687 OBD2: ECM/PCM Power Relay Control Circuit High

JC Landry August 24, 2025

Learn all about the P0687 code, what causes ECM/PCM power relay control circuit high, and how to diagnose and fix common issues to maintain optimal engine performance.

P0688 OBD2: ECM/PCM Power Relay Sense Circuit/Open

JC Landry August 24, 2025

Learn all about the P0688 code, what causes issues with the ECM/PCM power relay sense circuit, and how to diagnose and fix common problems to maintain optimal engine performance.

P0689 OBD2: ECM/PCM Power Relay Sense Circuit Low

JC Landry August 24, 2025

Learn all about the P0689 code, what causes ECM/PCM power relay sense circuit low, and how to diagnose and fix common issues to maintain optimal engine performance.

P068A OBD2: ECM/PCM Power Relay De-Energized Performance – Too Early

JC Landry August 24, 2025

Learn all about the P068A code, what causes ECM/PCM power relay de-energized performance issues, and how to diagnose and fix common issues to maintain optimal engine performance.

P068B OBD2: ECM/PCM Power Relay De-Energized Performance – Too Late

JC Landry August 24, 2025

Learn all about the P068B code, what causes ECM/PCM power relay de-energized performance issues, and how to diagnose and fix common issues to maintain optimal engine performance.

P068C OBD2: Cylinder 7 Glow Plug Control Circuit Low

JC Landry August 24, 2025

Learn all about the P068C code, what causes cylinder 7 glow plug control circuit low, and how to diagnose and fix common issues to maintain optimal engine performance.

P068D OBD2: Cylinder 7 Glow Plug Control Circuit High

JC Landry August 24, 2025

Learn all about the P068D code, what causes cylinder 7 glow plug control circuit high, and how to diagnose and fix common issues to maintain optimal engine performance.

P068E OBD2: Cylinder 8 Glow Plug Control Circuit Low

JC Landry August 24, 2025

Learn all about the P068E code, what causes cylinder 8 glow plug control circuit low, and how to diagnose and fix common issues to maintain optimal engine performance.

P068F OBD2: Cylinder 8 Glow Plug Control Circuit High

JC Landry August 24, 2025

Learn all about the P068F code, what causes cylinder 8 glow plug control circuit high, and how to diagnose and fix common issues to maintain optimal engine performance.

P0690 OBD2: ECM/PCM Power Relay Sense Circuit High

JC Landry August 24, 2025

Learn all about the P0690 code, what causes ECM/PCM power relay sense circuit high, and how to diagnose and fix common issues to maintain optimal engine performance.