Transmission Internal Mode Switch B Circuit High
The P2888 code means the vehicle's onboard diagnostic system has detected: Transmission Internal Mode Switch B Circuit High. This is a moderate severity code.
- Keep driving?
- No — stop driving
- DIY difficulty
- hard
- Estimated cost
- $300 - $1,200 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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What Are the Symptoms of P2888?
- Transmission Internal Mode Switch B signal too high
- Harsh or firm shifting
- Check Engine Light on
- Transmission warning light on
What Causes P2888? (Most Likely First)
- Open circuit in internal mode switch B wiring Very High
- Disconnected internal mode switch B connector High
- Terminal corrosion Moderate
- TCM reference voltage issue Low
Can I Still Drive with P2888?
No — stop driving. P2888 is rated moderate severity. Continuing to drive in this state risks further damage — get it looked at before your next trip.
Frequently Asked Questions
What does a high circuit mean?
A high circuit indicates the signal voltage exceeds the maximum expected value, usually from an open wire or disconnected component.
Is this safe to ignore?
No. High circuit readings can cause the TCM to make incorrect decisions, potentially leading to harsh shifts or transmission damage.
How long does this repair take?
Wiring and connector repairs typically take 1-3 hours. Internal component replacement may require 4-8 hours including transmission removal.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2888?
-
Read all transmission DTCs
-
Check internal mode switch B connector integrity
-
Test for open circuits in wiring harness
-
Verify TCM reference voltage output
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)
Which Vehicles Commonly Get P2888?
- 2010-2019 Honda CR-V
- 2012-2020 Toyota RAV4
- 2014-2020 Nissan Rogue
- 2011-2020 Chevrolet Traverse
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