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Code P173F

Quick reference

P173F at a glance

Plain-language meaning
This code means that a sensor in the car that helps control the shifting of gears is not working properly. It's like a helper that tells the car when to change gears, but it's not doing its job right now.
Urgency
Moderate – It's important to address this issue soon to prevent further damage to the transmission.
Difficulty
Moderate
System
Sensor Issue
Tools mentioned
OBD-II scanner, Multimeter, Basic hand tools

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

Laymans terms

This code means that a sensor in the car that helps control the shifting of gears is not working properly. It's like a helper that tells the car when to change gears, but it's not doing its job right now.

Explanation

The P173F code indicates a problem with the sensor circuit for the shift rod 1/3, specifically that the circuit is reading a higher voltage than expected.

Technical description

The P173F code is triggered when the Powertrain Control Module (PCM) detects a high voltage condition in the shift rod 1/3 sensor circuit. This sensor is responsible for monitoring the position of the shift rod, which is crucial for the proper operation of the transmission.

Symptoms

• Check Engine Light is on

• Transmission may not shift correctly

• Poor vehicle performance

Common Causes

• Faulty shift rod sensor

• Wiring issues or short circuit

• Malfunctioning PCM

Glossary

PCM: Powertrain Control Module, the computer that controls the engine and transmission.

OBD-II: On-Board Diagnostics II, a standardized system for self-diagnostics in vehicles.

Diagnosis steps

• Use an OBD-II scanner to confirm the code

• Inspect the wiring and connectors for damage

• Test the shift rod sensor for proper operation

Repair procedures

• Replace the faulty shift rod sensor

• Repair or replace damaged wiring

• Reprogram or replace the PCM if necessary

Tools required

• OBD-II scanner

• Multimeter

• Basic hand tools

Estimated repair cost

$150 - $500

Difficulty level

Moderate

Commonly affected vehicles

• Volkswagen Passat

• Audi A4

• Skoda Octavia

Preventive measures

• Regular maintenance checks

• Ensure proper wiring connections

• Avoid harsh driving conditions

Error code type

Sensor Issue

User experience recommendations

• Do not ignore the Check Engine Light

• Get the vehicle inspected by a professional

• Avoid driving long distances until repaired

Warranty information

Check with the vehicle manufacturer for specific warranty coverage related to transmission components.

Historical data

This code has been known to appear in vehicles with high mileage or those that have experienced transmission issues in the past.

Urgency level

Moderate – It's important to address this issue soon to prevent further damage to the transmission.

Testing conditions

• Vehicle in park or neutral

• Engine running

Component location

The shift rod sensor is typically located near the transmission assembly.

FAQs

Q: Can I drive with a P173F code?
A: It's not recommended to drive for long distances with this code, as it may cause further damage to the transmission.

Q: How do I reset the Check Engine Light after fixing the issue?
A: You can use an OBD-II scanner to clear the code, or disconnect the battery for a few minutes.

Optional diagnostic gear

Tools that may help diagnose P173F

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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