P1837 — Transmission Transfer Case Rear Shaft Speed Sensor Circuit Failure

What Does P1837 Mean?

P1837 is a manufacturer-specific diagnostic trouble code: Transmission Transfer Case Rear Shaft Speed Sensor Circuit Failure. This code applies to OTHER, BUICK, CADILLAC, CHEVY, GM vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1837

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Transmission Transfer Case Rear Shaft Speed Sensor readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in Transmission Transfer Case Rear Shaft Speed Sensor circuit (damaged, chafed, or corroded)
🔍 Faulty Transmission Transfer Case Rear Shaft Speed Sensor connector or terminal
🔍 Failed Transmission Transfer Case Rear Shaft Speed Sensor
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P1837 mean?

P1837 indicates: Transmission Transfer Case Rear Shaft Speed Sensor Circuit Failure. The vehicle's computer has detected that the Transmission Transfer Case Rear Shaft Speed Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1837?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1837 for extended periods may cause additional problems.

How much does it cost to fix P1837?

Repair costs for P1837 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect and repair Transmission Transfer Case Rear Shaft Speed Sensor wiring and connectors
🔧 Replace faulty Transmission Transfer Case Rear Shaft Speed Sensor

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1837: Transmission Transfer Case Rear Shaft Speed Sensor Circuit Failure