P1244 Code: Meaning, Symptoms, Causes & Fix

Overview

Symptoms

• check engine light
• rough operation in certain conditions
• reduced performance

Common causes

• Reference/ground fault affecting alternator load input failed high
• Sensor output out of expected upper range
• Connector pin damage/corrosion or harness stress near related components

How to diagnose P1244

1. Confirm P1244 and capture freeze-frame data with a professional scan tool.
2. Inspect wiring, connectors, and grounds related to alternator load input failed high for obvious defects.
3. Compare live data against expected upper threshold and verify reference voltage.
4. Check for related DTCs to identify the root-cause chain before replacing parts.
5. After repair, clear codes and confirm readiness monitors complete without recurrence.

Severity of code P1244

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

Can you drive with P1244?

Most vehicles can be driven short-term with P1244, 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)

1. Repair obvious wiring/connector faults first to prevent repeat parts replacement.
2. Address the root fault mode (high) in the alternator load input failed high circuit/system.
3. Apply the required relearn/adaptation procedure if specified by service information.
4. Road-test and verify P1244 remains cleared under the conditions that originally set the code.

Fix options

• Replace failed sensor if signal remains high.
• Verify reference voltage and inspect wiring.
• Clear DTCs and verify with live data and completed drive cycle.

Typical repair cost

$200-$900

Common mistakes when diagnosing P1244

• 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.

P1244 in common vehicles

P1244 appears across makes such as Nissan, Hyundai, Kia, Volkswagen. Failure patterns differ by platform: wiring routes, software calibration, and component supplier revisions can change root cause.

Frequently asked questions

What causes P1244?

P1244 is commonly set by high faults affecting alternator load input failed high.

How much does it cost to fix P1244?

For P1244, repair costs are typically $200-$900 depending on exact root cause, labor rates, and part quality.

Can I clear P1244 without repair?

You can clear P1244 temporarily, but the code usually returns until the underlying fault is corrected.

Helpful tools

• Estimate repair cost
• Decode your VIN
• Calculate fuel cost