P0713: Transmission Fluid Temperature Sensor Circuit High Input

What P0713 usually means

P0713 is the high-input version of the transmission fluid temperature circuit fault. On many sensor circuits, a high-voltage or open-circuit condition translates into an unrealistically cold temperature reading. That matters because the controller may hold higher line pressure, delay lockup, or keep cold-shift strategy longer than it should. The code often comes from open wiring, loose connectors, or a failed sensor that no longer reports temperature accurately.

Start here before chasing parts

• Scan first: save freeze-frame and pending codes before clearing anything.
• Confirm the complaint: compare the stored code with current drivability symptoms.
• Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
• Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.

Suggested workflow

1. Confirm the temperature reading is implausibly low for actual operating conditions.
2. Inspect for open circuits, high resistance, and connector issues.
3. Wiggle-test the harness if the cold-biased reading comes and goes.
4. Repair the circuit or replace the failed sensor assembly as proven.
5. Verify that the temperature reading rises normally and shift feel normalizes after repair.

Common mistakes

• Ignoring the scan-tool temperature value and focusing only on the shift complaint.
• Replacing transmission hard parts when the controller is really stuck in a false cold-strategy story.

Practical fix guidance

• Correct the electrical high-input cause first, then confirm the transmission leaves cold-shift strategy at a believable time.
• If the sensor is internal to the pan or mechatronic harness, plan the repair accordingly instead of guessing with external parts.

Affected brands in this MVP

• Ford
• Chevrolet

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.