P1118 Code: Meaning, Symptoms, Causes & Fix

Overview

Code P1118 indicates a fault in Manifold Absolute Temperature Circuit Low Input, typically within ABS/chassis dynamics and brake control.

Symptoms

chassis warning indicator
reduced stability control performance
longer braking intervention

Common causes

Open circuit in wiring affecting manifold absolute temperature circuit low input
Broken terminal inside harness
Connector pin damage/corrosion or harness stress near related components

How to diagnose P1118

Confirm P1118 and capture freeze-frame data with a professional scan tool.
Inspect wiring, connectors, and grounds related to manifold absolute temperature circuit low input 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 P1118

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

Can you drive with P1118?

Most vehicles can be driven short-term with P1118, 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 manifold absolute temperature circuit low input circuit/system.
Apply the required relearn/adaptation procedure if specified by service information.
Road-test and verify P1118 remains cleared under the conditions that originally set the code.

Fix options

Repair open circuit and secure connector lock.
Restore continuity and verify pin tension.
Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$240-$1200

Common mistakes when diagnosing P1118

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.

P1118 in common vehicles

P1118 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 P1118?

P1118 is commonly set by open faults affecting manifold absolute temperature circuit low input.

How much does it cost to fix P1118?

For P1118, repair costs are typically $240-$1200 depending on exact root cause, labor rates, and part quality.

Can I clear P1118 without repair?

You can clear P1118 temporarily, but the code usually returns until the underlying fault is corrected.