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Code P0908

Quick reference

P0908 at a glance

Plain-language meaning
This code means that the car's computer is having trouble figuring out which gear the car should be in because there's an issue with the part that tells it what gear is selected.
Urgency
Moderate – While the car may still be drivable, it's important to address the issue to avoid potential transmission damage.
Difficulty
Moderate
System
Sensor Issue
Tools mentioned
OBD-II scanner, Multimeter, Wiring repair tools

This summary uses the existing diagnostic information shown in full below.

Laymans terms

This code means that the car's computer is having trouble figuring out which gear the car should be in because there's an issue with the part that tells it what gear is selected.

Explanation

The P0908 code is triggered when the transmission control module (TCM) detects an intermittent problem with the gate select position circuit, which helps determine the current gear selection.

Technical description

The P0908 code indicates that there is an intermittent fault in the gate select position circuit A. This circuit is responsible for communicating the current gear selection to the transmission control module. An intermittent fault means that the problem occurs sporadically, which can make it difficult to diagnose.

Symptoms

• Check Engine Light is on

• Transmission may not shift properly

• Vehicle may enter 'limp' mode

Common Causes

• Faulty gate select position sensor

• Wiring issues such as damaged or corroded connectors

• Faulty transmission control module (TCM)

Glossary

Transmission Control Module (TCM): A computer that controls the transmission's operation.

Gate Select Position Sensor: A sensor that helps determine the current gear selection.

Diagnosis steps

• Use an OBD-II scanner to confirm the code.

• Inspect the wiring and connectors for damage or corrosion.

• Test the gate select position sensor for proper operation.

Repair procedures

• Replace or repair damaged wiring or connectors.

• Replace the gate select position sensor if faulty.

• Reprogram or replace the transmission control module if necessary.

Tools required

• OBD-II scanner

• Multimeter

• Wiring repair tools

Estimated repair cost

$150 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Toyota Camry

• Honda Accord

• Ford Fusion

Preventive measures

• Regularly inspect and maintain transmission components.

• Ensure connectors are clean and secure.

• Address transmission issues promptly to prevent further damage.

Error code type

Sensor Issue

User experience recommendations

• Do not ignore the Check Engine Light; get it checked as soon as possible.

• Avoid harsh driving until the issue is resolved to prevent further damage.

Warranty information

Check if your vehicle's powertrain warranty covers transmission components.

Historical data

Intermittent circuit issues have been reported in various models, often due to wiring problems.

Urgency level

Moderate – While the car may still be drivable, it's important to address the issue to avoid potential transmission damage.

Testing conditions

• Vehicle stationary with engine running

• Shifting through gears to test sensor response

Component location

The gate select position sensor is typically located on the transmission housing.

FAQs

Q: Can I drive my car with a P0908 code?
A: It's possible to drive, but it's not recommended as it may cause further transmission damage.

Q: How can I prevent this issue from happening again?
A: Regular maintenance and inspections of the transmission system can help prevent such issues.

Optional diagnostic gear

Tools that may help diagnose P0908

THINKCAR ThinkScan Bidirectional diagnostic tool illustration

High-End · Full-system diagnostics

THINKCAR ThinkScan Bidirectional

A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.

Network faults often require full-system access instead of a generic code reader alone.

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Klein Tools MM325 diagnostic tool illustration

Universal · Digital multimeter

Klein Tools MM325

A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.

Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.

View on Amazon
WORKPRO Wiring Repair Kit diagnostic tool illustration

Universal · Wire connectors and repair kit

WORKPRO Wiring Repair Kit

Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.

Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.

View on Amazon

These are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.

Source: ezOBD2 diagnostic database
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