How expensive are transmission repairs?

Transmission repairs vary from $300 for a solenoid replacement to $2,500+ for a full transmission rebuild or replacement. Early diagnosis can often prevent the most expensive repairs.

What does it mean when my car goes into limp mode?

Limp mode is a protective feature that limits your vehicle to a single gear to prevent further transmission damage. It is triggered by serious transmission faults and requires immediate professional attention.

P0734

Gear 4 Incorrect Ratio

Severetransmission

Overview

The P0734 diagnostic trouble code signals a gear 4 incorrect ratio condition detected by the transmission control module. This code relates to the automatic transmission system and may affect shift quality, timing, or overall transmission performance. Prompt attention is important to prevent further transmission damage.

Symptoms

Harsh or delayed shifting
Vehicle stuck in one gear (limp mode)
Unusual whining or grinding noise from transmission
Loss of one or more gears

Common Causes

Failed torque converter
Low or contaminated transmission fluid
Faulty shift solenoid or solenoid pack
Worn or damaged internal transmission components

Diagnosis Steps

1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
2Check transmission fluid level and condition; top off or replace if needed
3Test the transmission speed sensors with a multimeter or scan tool
4Inspect wiring and connectors for the transmission harness
5Perform a transmission pressure test if accessible

Estimated Repair Cost

$300 — $2,500

Cost varies by vehicle, location, and repair shop. Includes parts and labor.

Commonly Affected Vehicles

Jeep Grand CherokeeHonda AccordNissan RogueRam 1500

Related Codes

P0730 P0218 P0700

More Transmission Codes

P0218Transmission Over Temperature Condition

Critical

P0700Transmission Control System (MIL Request)

Severe

P0701Transmission Control System Range/Performance

Severe

P0702Transmission Control System Electrical

Severe

P0703Torque Converter/Brake Switch "B" Circuit

Moderate

P0704Clutch Switch Input Circuit Malfunction

Moderate

Frequently Asked Questions

Driving with a transmission code is risky. Continued driving can cause further damage to the transmission, resulting in significantly higher repair costs. Have it inspected as soon as possible.