P0737 Code: Meaning, Symptoms, Causes & Fix

Overview

Code P0737 indicates a fault in TCM Engine Speed Output Circuit, typically within powertrain controls.

Symptoms

increased fuel use
reduced performance
rough operation in certain conditions

Common causes

Disconnected or loose connector affecting tcm engine speed output circuit
Broken terminal inside harness
Connector pin damage/corrosion or harness stress near related components

How to diagnose P0737

Confirm P0737 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to tcm engine speed output circuit for obvious defects.
Use a continuity test from module pin to component to identify opens/high resistance.
Check for related DTCs to identify the root-cause chain before replacing parts.
After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P0737

Moderate: This code is moderate severity: the vehicle may still operate, but fault progression can increase repair cost over time.

Can you drive with P0737?

Most vehicles can be driven short-term with P0737, but postpone heavy load/highway driving until repaired.

If the warning lamp is flashing or drivability/safety is affected, avoid driving and diagnose immediately.

How to fix it (step-by-step)

Repair obvious wiring/connector faults first to prevent repeat parts replacement.
Address the root fault mode (open) in the tcm engine speed output circuit circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P0737 remains cleared under the conditions that originally set the code.

Fix options

Clear corrosion and protect terminals.
Repair open circuit and secure connector lock.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$200-$900

Common mistakes when diagnosing P0737

Replacing parts without verifying voltage, ground, and signal integrity first.
Ignoring related stored/pending codes that indicate upstream faults.
Skipping post-repair verification drive cycle and readiness checks.

P0737 in common vehicles

P0737 appears across makes such as Ford, Toyota, Honda, Chevrolet. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P0737?

P0737 is commonly set by open faults affecting tcm engine speed output circuit.

How much does it cost to fix P0737?

For P0737, repair costs are typically $200-$900 depending on exact root cause, labor rates, and part quality.

Can I clear P0737 without repair?

You can clear P0737 temporarily, but the code usually returns until the underlying fault is corrected.