P1736 Code: Meaning, Symptoms, Causes & Fix

Overview

Code P1736 indicates a fault in Second Gear Switch Circuit Malfunction, typically within powertrain controls.

Symptoms

reduced performance
increased fuel use
check engine light

Common causes

Disconnected or loose connector affecting second gear switch circuit malfunction
Broken terminal inside harness
Connector pin damage/corrosion or harness stress near related components

How to diagnose P1736

Confirm P1736 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to second gear switch circuit malfunction 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 P1736

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

Can you drive with P1736?

Most vehicles can be driven short-term with P1736, 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 second gear switch circuit malfunction circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P1736 remains cleared under the conditions that originally set the code.

Fix options

Restore continuity and verify pin tension.
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 P1736

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.

P1736 in common vehicles

P1736 appears across makes such as BMW, Mercedes-Benz, Audi, Volvo. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1736?

P1736 is commonly set by open faults affecting second gear switch circuit malfunction.

How much does it cost to fix P1736?

For P1736, repair costs are typically $200-$900 depending on exact root cause, labor rates, and part quality.

Can I clear P1736 without repair?

You can clear P1736 temporarily, but the code usually returns until the underlying fault is corrected.