ezOBD2 - Free OBD2 Code Lookup and Check Engine Light Diagnostic Tool

Find Your OBD2 Code Fast

Type the code from your scanner to get causes, symptoms, and fixes.

Code P17EA

Quick reference

P17EA at a glance

Plain-language meaning
This code means there's a problem with how the car changes from 5th gear to 6th gear. It's like when you're riding a bike and the chain slips when you try to change gears.
Urgency
High – Driving with this issue can cause further damage to the transmission.
Difficulty
Difficult
System
Transmission Issue
Tools mentioned
OBD-II scanner, Transmission fluid level gauge, Basic hand tools

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

Laymans terms

This code means there's a problem with how the car changes from 5th gear to 6th gear. It's like when you're riding a bike and the chain slips when you try to change gears.

Explanation

The transmission control module (TCM) monitors the gear ratios during shifts. If it detects an unexpected ratio during the shift from 5th to 6th gear, it triggers this code.

Technical description

The P17EA code indicates that the transmission control module has detected an incorrect gear ratio during the shift from 5th to 6th gear. This can be due to mechanical issues within the transmission or problems with the sensors that monitor gear ratios.

Symptoms

• Check Engine Light is on

• Transmission slipping

• Poor acceleration

Common Causes

• Faulty transmission solenoid

• Worn or damaged gears

• Malfunctioning transmission control module

Glossary

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

Gear Ratio: The ratio of the rotational speeds of two or more interlocking gears.

Diagnosis steps

• Use an OBD-II scanner to confirm the code

• Inspect transmission fluid levels and condition

• Check for any visible damage to the transmission

Repair procedures

• Replace faulty transmission solenoid

• Repair or replace damaged gears

• Reprogram or replace the transmission control module

Tools required

• OBD-II scanner

• Transmission fluid level gauge

• Basic hand tools

Estimated repair cost

$500 - $2000

Difficulty level

Difficult

Commonly affected vehicles

• Nissan Altima

• Infiniti Q50

• Nissan Maxima

Preventive measures

• Regular transmission fluid changes

• Avoid aggressive driving

• Ensure timely maintenance checks

Error code type

Transmission Issue

User experience recommendations

• Avoid driving the vehicle until repaired

• Consult a professional mechanic

• Do not ignore the Check Engine Light

Warranty information

Transmission repairs may be covered under the powertrain warranty if the vehicle is still within the warranty period.

Historical data

This code has been commonly reported in vehicles with CVT transmissions, particularly in models from the early 2010s.

Urgency level

High – Driving with this issue can cause further damage to the transmission.

Testing conditions

• Vehicle at operating temperature

• Driving conditions that require shifting from 5th to 6th gear

Component location

The transmission is located beneath the vehicle, typically between the engine and the drive shaft.

FAQs

Q: Can I drive with a P17EA code?
A: It is not recommended to drive with this code as it can cause further transmission damage.

Q: How can I prevent this code from occurring?
A: Regular maintenance and avoiding aggressive driving can help prevent transmission issues.

Optional diagnostic gear

Tools that may help diagnose P17EA

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.

View on Amazon
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
🌙