AutoCodes – Generic – U1701

U1701 Code - Powertrain Control Module Signal Invalid

Quick Answer

The Powertrain Control Module (PCM) is the vehicle’s main engine and drivetrain computer. Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U1701 indicates Powertrain Control Module Signal Invalid.
Common causes: Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 53

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 10, 2025

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code U1701 Description

The Powertrain Control Module (PCM) is the vehicle’s main engine and drivetrain computer. It receives signals from a wide range of sensors—such as engine speed, coolant temperature, throttle position, manifold pressure, vehicle speed, transmission gear selection, and oxygen sensors—and uses that information to control fuel delivery, ignition timing, air-fuel ratio, idle speed, emission systems, charging rate, and even certain transmission and speed-control functions. The PCM continuously adjusts these outputs to match driving conditions and operates in two modes: open loop, where it follows preset programming without monitoring all sensors, and closed loop, where it fine-tunes engine operation based on live feedback, especially from the oxygen sensors, to maintain ideal performance, fuel economy, and emissions.

OBDII Code U1701 - Powertrain Control Module Signal Invalid - AutoCodes.com — U1701 Code - Powertrain Control Module Signal Invalid

What does this mean?

What are the Possible Causes of the DTC U1701?

Faulty Powertrain Control Module (PCM)
Powertrain Control Module harness is open or shorted
Powertrain Control Module circuit poor electrical connection

How to Fix the DTC U1701?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1701 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the U1701 code?

Need more information on how to fix the U1701 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

U1701 Chrysler — Powertrain Control Module Signal Invalid
U1701 Dodge — Powertrain Control Module Signal Invalid
U1701 Jeep — Powertrain Control Module Signal Invalid
U1701 RAM — Powertrain Control Module Signal Invalid

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.