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.

P071F OBD2: Transmission Mode Switch “B” Circuit High

JC Landry August 22, 2025

Learn all about the P071F code, what causes transmission mode switch "B" circuit high, and how to diagnose and fix common issues to maintain optimal vehicle performance.

P0721 OBD-II: Output Speed Sensor Circuit Range/Performance

JC Landry August 22, 2025

Learn all about the P0721 code, what causes output speed sensor circuit range/performance issues, and how to diagnose and fix common issues to maintain optimal engine performance.

P0723 OBD2: Output Speed Sensor Circuit Intermittent

JC Landry August 22, 2025

Learn all about the P0723 code, what causes Output Speed Sensor Circuit Intermittent, and how to diagnose and fix common issues to maintain optimal engine performance.

P0724 OBD2: Brake Switch “B” Circuit High

JC Landry August 22, 2025

Learn all about the P0724 code, what causes the brake switch "B" circuit high, and how to diagnose and fix common issues to maintain optimal vehicle performance.

P0726 OBD2: Engine Speed Input Circuit Range/Performance

JC Landry August 22, 2025

Learn all about the P0726 code, what causes engine speed input circuit range/performance issues, and how to diagnose and fix common problems to maintain optimal engine performance.

P0727 OBD2: Engine Speed Input Circuit no Signal

JC Landry August 22, 2025

Learn all about the P0727 code, what causes engine speed input circuit no signal, and how to diagnose and fix common issues to maintain optimal engine performance.

P0728 OBD2: Engine Speed Input Circuit Intermittent

JC Landry August 22, 2025

Learn all about the P0728 code, what causes engine speed input circuit intermittent, and how to diagnose and fix common issues to maintain optimal engine performance.

P0729 OBD2: Gear 6 Incorrect Ratio

JC Landry August 22, 2025

Learn all about the P0729 code, what causes gear 6 incorrect ratio, and how to diagnose and fix common issues to maintain optimal engine performance.

P072A OBD2: Stuck in Neutral

JC Landry August 22, 2025

Learn all about the P072A code, what causes Stuck in Neutral, and how to diagnose and fix common issues to maintain optimal engine performance.

P072B OBD2: Stuck In Reverse

JC Landry August 22, 2025

Learn all about the P072B code, what causes the transmission to get stuck in reverse, and how to diagnose and fix common issues to maintain optimal vehicle performance.