Volvo · 1999–2016
Common Volvo V70 problems, and how to check them
These are the 4 faults owners and garages report most often on the Volvo V70, from the most common down. For each one: what goes wrong, how to check it yourself, and the usual fix, so you know what you’re dealing with before you buy parts.
Checked and updated 26 September 2026
Problem 1
Blocked crankcase ventilation (PCV) pushing out oil
What goes wrong
The PCV oil trap and hoses clog with sludge, crankcase pressure rises, and oil is pushed out past seals (cam seals, rear main seal).
How to check it yourself
With the engine idling, stretch a rubber glove over the oil filler: if it inflates, crankcase pressure is too high. A whistling noise can also point to a split PCV hose.
The usual fix
Replace the PCV oil trap (flame trap) and hoses as a set, then fix any seals it has pushed out. Treat it as maintenance every 100,000-150,000 km.
Signs: Oil leak, High oil consumption, Rough idle
Fault codes: P0171
Problem 2
Electronic throttle module (ETM) fault: limp mode and poor idle
What goes wrong
The electronic throttle module wears its internal position sensor tracks, so the engine computer sees conflicting signals and cuts power ("Accelerate reduced").
How to check it yourself
Read the codes and compare the throttle position signals in live data; clean the throttle body and see if the fault returns.
The usual fix
Clean the throttle body and run the throttle adaptation; if the fault returns, replace or recondition the throttle module.
Signs: Rough idle, Stalling, Loss of power, Check engine light
Fault codes: P1657, P2135, P0121
Problem 3
Harsh 2-3 shifts, delayed engagement, or slipping automatic
What goes wrong
The valve body design wears the internal servo and clutch packs; old fluid speeds it up. Symptoms move from rough 2-3 shifts to delayed engagement and lost gears.
How to check it yourself
Read the gearbox codes and adaptation values; check the fluid level and condition (dark or burnt fluid is a warning).
The usual fix
Change the fluid (a few drain-and-fills) and update the gearbox software; a worn valve body can be replaced with the revised design. Slipping gears need a gearbox specialist.
Signs: Harsh shifting, Transmission slipping
Fault codes: P0700, P0731, P0732, P0733, P0734
Problem 4
Sooted EGR valve or sticking swirl flaps on the D5
What goes wrong
Soot clogs the EGR valve and the intake swirl flaps, and the plastic swirl-flap linkage can break or come off.
How to check it yourself
Look at the swirl-flap linkage rod on top of the engine for a broken or detached joint; read EGR and swirl codes and check boost.
The usual fix
Reconnect or replace the swirl-flap linkage or actuator; clean the intake manifold and EGR valve, or replace the EGR valve.
Signs: Loss of power, Rough idle, Check engine light, Black smoke
Fault codes: P0401, P0402, P2008, P2009, P0299
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer