P1720 fault code: what it means

P1720: Output speed sensor / wheel speed rationality on Cherokee KL. FCA bulletin replaces a PTU with a broken input spline (warranty extension). Grinding or no drive.

Engine and gearbox (powertrain) · Safety risk

Usual causes, most likely first

broken PTU input spline
output speed sensor
wheel speed sensor

P1720 by make

Jeep

Output speed sensor / wheel speed rationality on Cherokee KL. FCA bulletin replaces a PTU with a broken input spline (warranty extension). Grinding or no drive.

Usual causes: broken PTU input spline; output speed sensor; wheel speed sensor

What the repair usually costs

ABS wheel speed sensor replace, one wheelNZ$130–NZ$610 · A$130–A$590

Not sure what P1720 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.