P0720 on Chrysler
Output Speed Sensor Circuit Malfunction
P0720 on Chrysler vehicles indicates output speed sensor circuit malfunction. Au7o has documented this code across 1 Chrysler model — most commonly on LeBaron. P0720 indicates a malfunction in the transmission output speed sensor circuit. The output speed sensor measures how fast the transmission's output shaft is turning, which the computer uses to calculate vehicle speed, control shift timing, and manage torque converter lockup. When the signal is missing or implausible, the transmission may shift harshly, get stuck in one gear (limp mode), or the speedometer may read incorrectly. The fault is usually in the sensor, its wiring, or the connector, though internal transmission issues can also be responsible. Typical repair costs on Chrysler range from $200 to $1,500, depending on the specific model and root cause.
Common Causes of P0720
- •Failed output (vehicle) speed sensor
- •Damaged wiring, connector, or corrosion in the sensor circuit
- •Metal debris on the sensor tip or damaged reluctor ring
- •Open or short in the signal circuit
- •Low or contaminated transmission fluid affecting components
- •Poor ground or reference voltage to the sensor
- •Faulty transmission control module (TCM/PCM)
P0720 on Chrysler by Model
Chrysler LeBaron(1 issue)
- A604 (41TE) Automatic Transaxle Electronic Shift Solenoid Failure1990-1995
The LeBaron uses the Chrysler A604 (41TE) 4-speed electronically-controlled automatic transaxle. This was one of the first fully electronic automatics and its solenoid pack is the primary failure point. The solenoids develop internal leaks and electrical failures, causing erratic shifting, no-shift conditions, and limp mode (locked in 2nd gear). The transmission controller can also fail. The A604 was so problematic that Chrysler extended warranty coverage on early units.
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View P0720 across all makes →Frequently Asked Questions
What does P0720 mean on Chrysler?▼
P0720 stands for "Output Speed Sensor Circuit Malfunction." P0720 indicates a malfunction in the transmission output speed sensor circuit. The output speed sensor measures how fast the transmission's output shaft is turning, which the computer uses to calculate vehicle speed, control shift timing, and manage torque converter lockup. When the signal is missing or implausible, the transmission may shift harshly, get stuck in one gear (limp mode), or the speedometer may read incorrectly. The fault is usually in the sensor, its wiring, or the connector, though internal transmission issues can also be responsible. On Chrysler specifically, this code is documented across 1 model.
What causes P0720 on Chrysler vehicles?▼
Common causes on Chrysler: Failed output (vehicle) speed sensor, Damaged wiring, connector, or corrosion in the sensor circuit, Metal debris on the sensor tip or damaged reluctor ring, Open or short in the signal circuit, Low or contaminated transmission fluid affecting components. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0720 on a Chrysler?▼
Repair costs on Chrysler range from $200 to $1,500, depending on the specific model and root cause.
Which Chrysler models have P0720 documented?▼
Au7o has documented P0720 on 1 Chrysler model: LeBaron.