P2891 moderate

Transmission Range Sensor B Circuit Low

The P2891 code means the vehicle's onboard diagnostic system has detected: Transmission Range Sensor B Circuit Low. This is a moderate severity code.

My Garage →
Keep driving?
No — stop driving
DIY difficulty
hard
Estimated cost
$300 - $1,200 (parts and labor)
ANCEL AD310 OBD-II Scanner
Check Your Fluid First
ANCEL AD310 OBD-II Scanner

Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.

Check Price on Amazon
LAUNCH CRP123X (Reads All Systems)
Read Transmission Codes
LAUNCH CRP123X (Reads All Systems)

Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.

Check Price on Amazon

Affiliate links — we earn a commission at no extra cost to you.

Common Symptoms

  • Transmission Range Sensor B signal missing
  • Transmission stuck in one gear
  • Check Engine Light on
  • Limp mode activated

Probable Causes (Ranked by Likelihood)

  • Short to ground in transmission range sensor B circuit Very High
  • Failed transmission range sensor B High
  • Corroded connector pins Moderate
  • TCM ground circuit fault Low

Frequently Asked Questions

What causes a low circuit reading?

A low circuit reading is typically caused by a short to ground in the wiring or an internal sensor failure that pulls the signal below minimum.

Can I fix this myself?

If the issue is an accessible connector or external wiring, a competent DIYer may be able to repair it. Internal transmission issues require professional service.

Will this get worse over time?

Yes, electrical issues tend to worsen. Intermittent problems can become permanent failures, potentially causing more expensive damage.

Mechanics Guide Step-by-step diagnosis

Step-by-Step Diagnostic Procedure

  1. Retrieve DTCs and freeze frame data

  2. Measure transmission range sensor B voltage at connector

  3. Test wiring for shorts to ground

  4. Inspect connector for corrosion

Sources 1

This page is built from documented references. Verify against your own service info before repair work.

  • SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)

Commonly Affected Vehicles

  • 2010-2020 Ford Escape
  • 2012-2019 Honda Civic
  • 2014-2020 Hyundai Sonata
  • 2011-2020 Kia Sorento

Related Codes

P2890P2892

Explore More

Search codes Vehicle-specific fixes Guides By make

Was this helpful?

Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.

Browse by symptom → Read repair guides → Fixes by vehicle →